peckham



W. H. PEGKHAM.

' MACHINE FOR BBNDING RINGS.

Patented Apr. 28, 1868.

Ira/"Wafer flatten. tetra gaunt ffite.

Letters Patent No. 77,312, dated April 28 1868.

IMPROVEMENT IN MACHINES FOB. BENDING RINGS.

an anon crank in in flgttt fitters smmant uniting 1nd at it: t me TO ALLWHOM IT MAY CONCERN;

Be it known that I, WILLIAM. H. PECKHAM, of the city, county, and Stateof New York, have invented a new and improved Machine for Bending Ringsj and I do hereby declare that the following is a full, clear, and exactdescription thereof, which will enable others skilled in the art to makeand use the some, reference being had to the accompanying drawings,-forming part of this specification. in which-- Fignr'e l represents anend elevation of my improved ring-bending machine.

Figure 2 is a side elevation of-the same.

Figure 3 is a detail horizontal section of the same, the plane ofsection being indicated by the line aux, fig. 1.

Similar letters of reference indicate corresponding parts, I

This invention relates to a new machine for bending metal bars intoperfect and correct rings, of any suitable diameter.

. Theinvention is particularly intended for jewellers use, toformfingr-rings, bracelets, and other suitable articles, but may, ifdesired, be used with equal advantage for shrinking tires and otherlarge and heavy rings. The invention consists in the use of two rollers,between which the bar to be bent is held, and in the use of twoadjustable friction-rollers, which, as they are held-nearer to orfurther from the pointatwhich the ring is held, form rests for the barto be bent, by which the same is transformed into a smaller or. largerring as may be desired. I

'The adjustable friction-rollers are fastened to curved slides, whichmove in curved guides, and-which are connected by means of pivoted rodsto cranks projecting from the faces of 'two gear-wheels, meshing intoeach other. Thus, as one of the gear-wheels is turned by suitablemechanism, its crank is broughthigher or lower,-

as may be desired, and Slide is' thereby mo ved up or down at will, theother gcar-wheelimoving its slide in.

exactly-thc samc manner.

The ends of the bar to be bent will, when the parts are correctlyadjusted for the length of the bar, be brought exactly against eachother, so that they can be easily .connectedby soldering orotherwise.

The-annoying and inconvenient'hammering and adjusting by means of whichrings were heretofore formed is altogether done away with by myinvention. I I

A represents the frame of the machine. 13 .Q are two horizontal axles,having their hearings in the frame, and geared together, so as torevolve in opposite directions. 7

The ends of the shafts B Cproject beyond one end of the frame, as shown,so-that a bar can be placed between them. Oneof the axles rests-inup-and-down.adjustable bearings, a a,- which can be raised and loweredby means of screws 6 b, or their equivalents. The object of theimprovementis to allow the insertion, between the shafts, of bars ofdifierent thicknesses. I I

Upon that face of the frame from which the ends of theaxles B 0 project,are arranged curved guides c'c, concentric around the lower axis 0, asis' clearly shown in figl-l. These guides may either be formed byprojectingrails, by sunk grooves, or otherwise, as may bedesired, I I

Uponorwithin these guides c c are placed curved slldes'd d ene on eachside of the axle C,- each slide carrying a projecting friction-roller, DD, near its upper end. The lower parts of theslides are, by means ofrods e a, connected with two gear-wheelsff, which meshinto each other,and which can be turned by means of suitable mechanism. I v I Theoperation is'as follows: The bar/tobe bent, which is previously cut tothe required length, is placed between the rollers B and 0, and then thewheels f are turned so as to bring-the rollers D D at such a distancefrom the point at which the bar is held, that the curve described by thebanwhenit is bent to rest upon the rollers D, will be part of the circleinto which it is desired to bend the bar. The axles B and C revolving inopposite directions, carry the bar forward, and every portion of thesame is thereby bent into therequired curve, so that thedesired ring isobtained.

It will be seen that by moving the slides further up or down, thediameter of the ring will be diminished or enlarged, and that when therollers D are bronght close to the-roller B, the inner diameter of thering will he equal to the outer-diameter of the roller 18..

The projectingends of the rollers B end C, or of either of them, may hemade removable, so that they can be replaced-by such which have 'groovesto receive hereof suiteble cross-section. The device may receive itsmotion from suitable mechanism.

Havingthu described my invention, what I claim as new,-'a.nd desire tosecure by Letters Potent, is-

1. The combination of the rerolving axles B 0, adjustablefriction-rollers D D, 'upon the concentric bearing-plates ii, concentricguides c, connecting-rode e, and geor-wheels ff, as herein described forthe purpose specified. v

2. The device herein shown and described of. operating thefriction-rollers D D, consisting of the guides c 1-, slides 12 d, rods ee, eind wheels'ff, ellmede and operating substentielly as herein shownand described.

3. Adjusting "the friction-rollers D D around the larger-rolleriG; andwith relation to the upper adjustable roller B, by means of the curvedplates d, operated in concentric guides around the roller 0, by theconnecting-rod e and gear-wheelsff, as herein described; v

' -WILLIAM H. PEGKHAM.- Witnesses:

"WM. F. McNAnAm, ALEX. F. Rename.

